package opera;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书！");
        System.out.println("请输入你要删除的图书的名字：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int currentSize = bookList.getUsedSize();
        int index = -1;
        for (int i = 0; i < currentSize; i++) {
            Book tmp = bookList.getBook(i);
            if (tmp.getName().equals(name)) {
                index = i;
                break;
            }
        }
            //挪动数据
            for (int j = index; j < currentSize-1; j++) {
                Book book = bookList.getBook(j+1);
                bookList.setBook(j, book);
            }
            //修改size
            bookList.setUsedSize(currentSize-1);
            //因为删除的是对象 所以 把最后一个置为null
            bookList.setBook(currentSize-1,null);
            System.out.println("删除成功！");
            }
}

